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Gap to Uniqlo jeans size

The short answer

Gap 6 is Uniqlo 28 or 29 by the two brands' own charts.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Gap size read across to Uniqlo. US numeric sizes on the left, Waist size on the right.
GapGap builds it forUniqlo, by chartSame labelUniqlo builds it forUniqlo also prints
000waist 24 in, hip 33.3 in24not publishedwaist 24 innot published
000waist 24 in, hip 33.3 in24not publishedwaist 24 innot published
000waist 24 in, hip 33.3 in24not publishedwaist 24 innot published
2waist 26.5 in, hip 36.3 in26 or 27not publishedwaist 26 innot published
4waist 27.5 in, hip 37.3 in27 or 28not publishedwaist 27 innot published
6waist 28.5 in, hip 38.3 in28 or 29not publishedwaist 28 innot published
8waist 29.5 in, hip 39.3 in29 or 30not publishedwaist 29 innot published
10waist 30.5 in, hip 40.3 in30not publishedwaist 30 innot published
12waist 32 in, hip 41.8 in32not publishedwaist 32 innot published
14waist 33.5 in, hip 43.3 in34not publishedwaist 34 innot published
16waist 35.5 in, hip 45.3 innot madenot publishednot publishednot published
18waist 37.5 in, hip 47.3 innot madenot publishednot publishednot published
20waist 39.5 in, hip 49.3 innot madenot publishednot publishednot published
22waist 41.5 in, hip 51.3 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Uniqlo chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

Uniqlo to Gap